code: def bbox(self):
      return BoundingBox(
          north=40.110222,
          west=115.924463,
          south=39.705711,
          east=116.803369,
      )
  
file_path: geoplotlib/examples/taxi.py
imports: from geoplotlib.layers import BaseLayer
  from geoplotlib.core import BatchPainter
  import geoplotlib
  from geoplotlib.colors import colorbrewer
  from geoplotlib.utils import epoch_to_str, BoundingBox, read_csv
label_desc: Use image node_id 3 for calling the TrailsLayer obj's underlying member method code with example usage: obj.bbox() and returns: BoundingBox